Method of casting car-coupling knuckles.



B. F. HAUGH.

METHOD OF CASTING GAR COUPLING KNUGKLES.

. ,1913v Patented Nov. 11, 1913.

UNITED sra'rns PATENT ormon.

BENJAMIN F. I-IA'UGH, OF ANDERSON, INDIANA.

METHOD OF CASTING GAR-COUPLING KNUGKLES.

LUVSAQQ.

Specification of Letters Patent.

, Application filed August 11, 1910, Serial at. 576,711. Renewed September 9, 1913. Serial No. 788,935.

To all whom it may concern:

Be it known that I, BENJAMIN F. HAUGH, a citizen of the United States, residing at Anderson, in the county of Madison and State of Indiana, have. invented certain new and useful Improvements in Methods of Casting Car-Coupling Knuckles, of which the following is a specification.

The object of my said invention is to provide a knuckle for car couplings the pivot bearing in which will be true and smooth, as cast, without fitting or dressing, and also capable of resisting wear to a greater degree than the metal of which the body of the knuckle is made, whereby the life of said knuckle may be prolonged and the expense of fitting the same reduced, and it consists not only in the improved form of knuckle, but also in the method of casting the same, wherebythe above objects are accomplished, all as will be hereinafter more fully described and claimed.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, Figure 1 is a sectional view through a core box used for forming cores for the pivot holes, or hearing, to be used in the molds for casting the knuckles, Fig. 2 a transverse section through the same on the dotted line 2-2 in Fig. 1, Fig. 3 a plan view of one of the knuckles in finished form, Fig. 4 a perspective view showing the pivot hearing lining separately, and Fig. 5 a sectional view through the knuckle on the dotted line 5-5 in Fig. 3. y

In said drawings the portions marked A. represent the core box, 13 the core, and C the knuckle.

The core box A is made in two parts and of the usual, or any approved form, except that it is enlarged throughout its central portion from a shoulder a. (see Fig. 1) near one end to another shoulder a" near the other end. Between said shoulders the diameter of the core box is increased to receive a metal tube, or lining, c and said shoulders are of a depth to just correspond to the thickness of said lining so that its inner sur face will be flush with the main face of the core box. I have shown said lining c in Fig. 4 as a solid tube, but, as will be readily understood, it may be a plate rolled into cylindrical form, or may be made up by several curved sections, (as indicated by dotted lines in Fig. 4), if preferred. Said lining of whatever form, whether a single part or several sections, is preferably made of selfhardcning metal such as described in Reissue Letters Patent No. 11,7O l, issued November .29, 1898 to myself and G. H. Vincett. I

In forming the core the core box is opened and the lining a put in its place between the shoulders at and a. .he core box is then closed and a core mold thus formed which is of uniform diameter from point 00 to point g and metal incased for the greater portion of its length. The core is made in the usual way byfilling the core box with sand, or other core material, properly prepared for the purpose.

core for the greater portion of its length, and said core is then placed in the mold, prepared in the usual way, for casting the knuckles. The ends of the lining c preferably ClQIlOl} extend quite to the ends of the molds so that in the casting said lining is entirely incased by the metal of the knuckles, as shownmost clearly in Fig. 5, the softer metal of the knuckle thus protecting The core box is then opened, the core removed, 1n-' cludlng the hnlng a, whlch now 1ncascs the the ends of the hardened metal of which said lining is composed.

The knuckles are cast in the usual manner by pouringthe molten metal into the mold to fill the same and surroundthe core, and allowing the same to cool, during which cooling process the metal of which the lining a is composed hardens as described in the patent above mentioned. After the cooling is completed the knuckle is taken out of the mold and the core removed, leaving a pivot bearing in the knuckle which is true, smooth and hard, requiring no dress ing in order to fit it for use, as is customary with knuckles cast in the usual way. The labor and expense of fitting is thus not only saved but a knuckle is provided which has been found capable of outwearing three knuckles made by the common method. A hearing is also secured which is adapted to give better results in use because of its true circular form, which enables the knuckle to turn freely and truly without binding or wabbling, as they do when the pivot bearings are imperfect, as is frequently the case with knuckles of the ordinary construction.

Having thus fully described my said invention, what I claim as new and desire to ecure by Letters Patent, is:

1. The method of casting knuckles for car couplings which consists in first forming a core for the pivot bearing by placing a tubular lining in the core boX, then forming said core principally within said lining,but extending outside each end thereof, then placing said core carrying said lining within the knuckle mold, then pouring the molten metal into said mold around said core, then allowing the casting to cool, and then removing said core, substantially as set forth.

2. The method of casting knuckles for car couplings which consists in embedding a metal lining for the pivot bearing within the core box used for forming the pivot bearing core, forming said core within said lining in said core box, and with ends projecting beyond the ends of said lining, removing aid core incased by said lining from said core box and placing the same in the knuckle mold, pouring the molten metal into said knuckle mold around the core, allowing the same to cool, then removing said knuckle, and then removing the core from the pivot bearing in said knuckle, substantially as set forth.

3. The method of casting car coupling knuckles consisting in taking a metal lining havin the characteristics that permit it to self-harden while cooling and closing the ends thereof, placing the closed-end tube in a knuckle mold, then pouring the metal that is to form the knuckle in the mold around the closed tube, gradually cooling the poured metal to slowly cool the closed tube within the knuckle and enable it to selfharden while in the knuckle metal, and finally removing the closure from the ends of 40 the hardened tube, whereby a straight smooth passa e will be formed by the selfhardened tube without machine work or drilling and the same be ready to receive the pivot pin of the knuckle.

4?. The 'niethod of casting car coupling knuckles consisting in taking a metal lining and placing a core filling therein with the ends or the core projecting beyond the ends of the tube but leaving the outer and end surfaces of the tube exposed, placing the closed tube in a mold, pouring molten metal in the mold around the exposed outer and end surfaces of the closed tube so as to retain the tube in place, allowing the casting to cool, and finally opening the tube by removing the filling from the straight smooth inner surface, whereby the knuckle will be provided with a straightsmooth passage ready to receive the pivot pin upon the cooling of the metal.

In witness whereof, I have hereunto set my hand and seal at Anderson, Endiana, this 6th day of August, A. 1)., nineteen hundred and ten.

BENJAMIN F. HAUGH. [1 s] lVitnesses B. O. HAUGH,

ORA BUHL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

